CN1597525A - Silicon slag removal treatment method in aluminium oxide production process - Google Patents
Silicon slag removal treatment method in aluminium oxide production process Download PDFInfo
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- CN1597525A CN1597525A CN 200410037936 CN200410037936A CN1597525A CN 1597525 A CN1597525 A CN 1597525A CN 200410037936 CN200410037936 CN 200410037936 CN 200410037936 A CN200410037936 A CN 200410037936A CN 1597525 A CN1597525 A CN 1597525A
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- slag
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- silicon
- silicon slag
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- 238000000034 method Methods 0.000 title claims abstract description 49
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 239000002893 slag Substances 0.000 title claims description 52
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims description 36
- 229910052710 silicon Inorganic materials 0.000 title claims description 36
- 239000010703 silicon Substances 0.000 title claims description 36
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 13
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 13
- 239000004571 lime Substances 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 239000003513 alkali Substances 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000008267 milk Substances 0.000 claims abstract description 6
- 210000004080 milk Anatomy 0.000 claims abstract description 6
- 235000013336 milk Nutrition 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 238000004090 dissolution Methods 0.000 claims description 32
- 239000002002 slurry Substances 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 11
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 9
- JCCZVLHHCNQSNM-UHFFFAOYSA-N [Na][Si] Chemical compound [Na][Si] JCCZVLHHCNQSNM-UHFFFAOYSA-N 0.000 claims description 8
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 239000012071 phase Substances 0.000 claims description 5
- 229910052681 coesite Inorganic materials 0.000 claims description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000007790 solid phase Substances 0.000 claims description 4
- 229910052682 stishovite Inorganic materials 0.000 claims description 4
- 229910052905 tridymite Inorganic materials 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 229910014106 Na-Si Inorganic materials 0.000 abstract 1
- 239000010802 sludge Substances 0.000 abstract 1
- 238000005245 sintering Methods 0.000 description 11
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 10
- 239000011734 sodium Substances 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 238000011084 recovery Methods 0.000 description 8
- 239000000292 calcium oxide Substances 0.000 description 7
- 229910001948 sodium oxide Inorganic materials 0.000 description 7
- 239000011550 stock solution Substances 0.000 description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000036571 hydration Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 239000004615 ingredient Substances 0.000 description 5
- 229910000503 Na-aluminosilicate Inorganic materials 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 235000019977 hydrated sodium calcium aluminosilicate Nutrition 0.000 description 4
- 239000000429 sodium aluminium silicate Substances 0.000 description 4
- 235000012217 sodium aluminium silicate Nutrition 0.000 description 4
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 4
- 239000002223 garnet Substances 0.000 description 3
- 238000001027 hydrothermal synthesis Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910001388 sodium aluminate Inorganic materials 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 238000004131 Bayer process Methods 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000009993 causticizing Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 229910052664 nepheline Inorganic materials 0.000 description 1
- 239000010434 nepheline Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
A process for treating the Na-Si dregs sludge generated in production of aluminium oxide includes such steps as solid-liquid separation adding alkali solution and lime milk to the Si dregs, stirring, loading in stripping tank, heating, stripping, solid-liquid separation, and returning the solution back to the aluminium oxide producing system.
Description
Technical Field
A desiliconization slag treatment method in the production process of aluminum oxide relates to a process method for producing aluminum oxide by adopting a sintering method, in particular to a desiliconization slag treatment method in the process.
Background
The technological process of sintering alumina includes compounding raw material, sintering clinker, dissolving out clinker, desiliconizing coarse liquid, carbonating decomposition, evaporating mother liquid, roasting aluminum hydroxide, etc. Crude liquid obtained after clinker is dissolved out contains high SiO2Can not be directly used for decomposition, and the sodium aluminate fine solution with the silicon content index of more than 600 can be obtained by a desiliconization process. Because a large amount of silicon slag is generated in the desilication process of crude liquid, the silicon slag also contains some sodium oxide and oxygenThe traditional method for treating the silicon slag is to return the silicon slag to the sintering method for batching to recover the alumina and the sodium oxide of the silicon slag. Because a large amount of silicon slag returns to the batching system again, after the procedures of clinker sintering, dissolving out, desiliconization and the like, the invalid components in the silicon slag form internal circulation, thereby reducing the productivity of the sintering method, increasing various consumptions and increasing the production cost.
With the development of the sintering method alumina production process, the reinforced sintering method alumina production process is gradually popularized and adopted. The technological process of the intensified sintering method is characterized in that the production efficiency of the alumina is improved by adopting high clinker alumina content, high clinker aluminum-silicon ratio and high liquid alumina concentration. Under the condition of unchanged ore resource grade, the use of a large amount of silicon slag for back-end blending has a certain influence on the improvement of the alumina content and the aluminum-silicon ratio of clinker, and the whole economic effect of the reinforced sintering method.
In a similar prior art, B. д Bonomilev et al, in 1957 invented high pressure hydration method for treating nepheline ore at high temperature with high concentration, α gKThe alumina in the ore is dissolved out under the conditions of circulating mother liquor and adding lime to obtain αK12-14 sodium aluminate solution, in 1971, Czech P. Kenan improved the high-pressure hydration method, and proposed a scheme for treating Bayer process red mud by high-temperature low-alkali dissolution, namely the hydrothermal method, but the method does not get rid of the high-pressure hydration method of αKDissolution conditions in 1982, P.J. Cleisweil et al improved the hydrothermal process, which retained the advantages of high temperature low base, but its solution αKReduced to 5-10, directly produced without Na2O, compounds containing little alumina, Hungary, since 1986, promoted the work of P.J. Cleisweil et al one step, α of the solutionKCooling to 4 deg.C, below 300 deg.C, Na2The recovery rate of O is more than 90 percent, AI2O3The recovery rate is more than 20%. The method has harsh operating conditions and unreasonable effectWant.
Disclosure of Invention
The invention aims to provide a desiliconization slag treatment method in the alumina production process, which can effectively separate and recover useful components in the sintering method silicon slag and avoid the formation of ineffective internal circulation caused by the back batching of a large amount of silicon slag, aiming at the defects of the prior art.
The purpose of the invention is realized by the following technical scheme.
The desilication slag treatment method in the production process of the aluminum oxide is characterized by comprising the following treatment processes in sequence: carrying out solid-liquid separation on the sodium-silicon slag slurry after desiliconization of the crude liquid through a filter, and sending the solution to an alumina production flow; washing the separated silicon slag solid phase, adding alkali liquor and lime milk to make the total alkali concentration Na in the slurry2OT30-50g/l, and the calcium-silicon molecular ratio CaO/SiO21.8-2.2, the solid-liquid ratio L/S is 5-7, after mixing and stirring uniformly, heating to 120-200 ℃ in a dissolution tank for dissolution under heat preservation for 40-150 minutes, sending the solid-liquid separation dissolution liquid to a red mud washing system in the alumina production flow, and discarding the slag phase.
By adopting the method of the invention, Na in the sodium-silicon slag2The dissolution rate of O reaches 90 percent, and Al2O3The dissolution rate reaches over 10 percent.
In the process of adding alkali and lime milk into the silicon slag for dissolution, the reaction mechanism is Ca (OH) at the temperature of 120-200 DEG C2Carrying out causticization reaction with sodium aluminosilicate, wherein calcium ions replace part of sodium ions in hydrated sodium aluminosilicate to generate hydrated sodium calcium aluminosilicate at the initial stage of the reaction, and the reaction formula is as follows:
due to the presence of CaO-AL2O3-SiO2-Na2O-H2The stable phases in the low concentration region of the O series are hydrated garnet and calcium silicate hydrate, so that the hydrated sodium calcium aluminosilicate has Ca (OH)2When present, it decomposes to form hydrated garnet with high silicon saturation (n ═ 1.5), and the reaction formula is shown below:
in the method, after the sodium-silicon slag slurry obtained after crude liquid desilication is subjected to solid-liquid separation and washing by a filter, the solution is sent to an alumina production flow, solid, namely silicon slag, alkali liquor with a certain concentration and lime milk are uniformly stirred in a mixing tank, then the mixture is heated and insulated in a pumping medium-pressure dissolution tank for dissolution, and finally the dissolved slurry is sent to a red mud washing system in the alumina production flow for solid-liquid separation.
Wherein the purpose of filtering and washing the sodium-silicon slag slurry is to reduce the content of aluminum oxide in the solution in the process of treating the silicon slag by the lime-water heating method. In the process of treating the silicon slag by the lime hydrothermal method, if aluminum oxide exists in the attached liquid of the silicon slag, after the lime is added, effective calcium oxide in the attached liquid firstly reacts with the aluminum oxide in the liquid phase to enter a solid phase, so that the amount of the effective calcium oxide which reacts with the silicon slag is reduced, the sodium removal effect is poor, and the loss of the aluminum oxide is caused.
The sodium oxide is added in the treatment process of the method of the invention, so as to dissolve out useful alumina in the silicon slag. In the process of treating the silicon slag by the lime hydration method, the dissolved stock solution NTThe concentration is 0-63g/l (N)K: 0-60g/l), the dissolution rate of sodium oxide is not greatly influenced, and the dissolution rate is along with N in the stock solutionTThe concentration is increased, and the dissolution rate of sodium oxide tends to be slightly reduced. Dissolution stock solution NTAt a concentration of 90g/l, the rate of dissolution of sodium oxide is relatively low. However, the dissolution stock solution NTThe dissolution rate of the alumina is slightly increased by the increase of the concentration, but the increase range is not obvious.
The core of the silicon slag treatment of the method adopts the medium dissolution temperature of 160 ℃ and the lime is added for dealkalization. It is based on the use of Ca (OH) at a temperature of 120 ℃ to 200 DEG C2Causticizing sodium aluminosilicate, wherein calcium ions replace partial sodium ions in hydrated sodium aluminosilicate to generate hydrated sodium calcium aluminosilicate in the initial stage of reaction, and then the hydrated sodium calcium aluminosilicate has Ca (OH)2If present, it decomposes to form a hydrated garnet with a high silicon saturation (n-1.5). This is one of the key technologies of the present invention.
The method of the present invention is also a technical key point of the present invention in the treatment of the residue after dissolution. Dissolving sodium-silicon slag by adopting a medium-pressure lime hydration methodAfter the extraction, its useful component Na2Most of O enters the solution, and Na in the residue is dissolved under proper dissolving conditions2The content of O can be controlled at about 1%, A/S is about 1.2-1.3, and the dissolved residue can be discharged from the production process. When the dissolved silicon slag slurry and the red mud primary washing liquid are mixed, the liquid phase components of the mixed slurry are relatively stable in 1 hour, 2 hours and 4 hours, and the solid phase chemical components and the phase compositions are basically unchanged, namely the dissolved silicon slag slurry and thered mud primary washing liquid can stably coexist. Therefore, the digestion slurry after the treatment of the silicon slag in the method is sent to a red mud washing system in the production flow of the alumina for solid-liquid separation.
Drawings
FIG. 1 is a block diagram of the process flow of the present invention.
Detailed Description
The process of the invention is further illustrated below with reference to examples:
the desiliconization slag treatment method in the production process of the aluminum oxide sequentially comprises the following treatment processes: carrying out solid-liquid separation on the sodium-silicon slag slurry after desiliconization of the crude liquid through a filter, and sending the solution to an alumina production flow; washing the separated silicon slag solid, adding alkali liquor and lime milk into the silicon slag after solid-liquid separation to ensure that the total alkali concentration Na in the slurry2OT30-50g/l, and the calcium-silicon molecular ratio CaO/SiO21.8-2.2, the solid-liquid ratio L/S is 5-7, after mixing and stirring uniformly, heating to 120-200 ℃ in a dissolution tank for heat preservation dissolution for 45-150 minutes, sending the solid-liquid separation dissolution liquid to a red mud washing system in the alumina production flow, and discarding slag phase.
Example 1
Adopts a phi 20 multiplied by 3.25 silicon slag settling tank with the diameter of 40m2A rotary drum filter and a phi 2.6 multiplied by 9.5 direct heating desilication unit are used for processing 1400 tons of silicon slag:
raw materials: sodium-silicon slag: SiO 2220.73％、Al2O325.4％、Na2OT11.35％、CaOT19.8％
Lime: CaO (CaO)T97％、fcaO87％
Controlling conditions: the dissolution temperature is 160 ℃, the dissolution time is 150min, and the calcium-silicon ratio of the ingredients is [ C/S]]2.0, the ingredient silicon slag slurry L/S is 5, and the dissolving stock solution NTThe main technical index obtained for 30g/l is that the recovery rate of sodium oxide is ηN91% recovery of alumina ηAThe content was 12%.
Example 2
Controlling conditions: the dissolution temperature is 150 ℃, the dissolution time is 150min, and the calcium-silicon ratio of the ingredients is [ C/S]]2.2, the L/S of the mixture silicon slag slurry is 6.5, and the dissolving-out stock solution NTThe concentration was 48 g/l. The other conditions were the same as in example 1. The main technical indexes obtained are as follows:
(1) η recovery rate of sodium oxideNIs 95 percent;
(2) and an alumina recovery rate ηAThe content was 11%.
Example 3
Controlling conditions: the dissolution temperature is 120 ℃, the dissolution time is 60min, and the calcium-silicon ratio of the ingredients is [ C/S]]1.8, the L/S of the ingredient silicon slag slurry is 5.2, and the dissolving-out stock solution NTThe concentration was 30 g/l. The other conditions were the same as in example 1. The main technical indexes obtained are as follows:
(1) η recovery rate of sodium oxideN95.5 percent;
(2) and an alumina recovery rateηAThe content was 10.5%.
Claims (2)
1. The desilication slag treatment method in the production process of the aluminum oxide is characterized by comprising the following treatment processes in sequence: carrying out solid-liquid separation on the sodium-silicon slag slurry after desiliconization of the crude liquid through a filter, and sending the solution to an alumina production flow; washing the separated silicon slag solid phase, adding alkali liquor and lime milk into the silicon slag after solid-liquid separation to ensure that the slurry has the total alkali concentration Na2OT30-50g/l, and the calcium-silicon molecular ratio CaO/SiO21.8-2.2, the solid-liquid ratio L/S is 5-7, after uniformly mixing and stirring, heating to 120-200 deg.C in dissolution tank, making heat-insulating dissolution for 45-150 min, and sending the solid-liquid separation dissolution liquor to alumina production processThe red mud in the system is washed, and the slag phase is discarded.
2. The method of claim 1, wherein: the desiliconization slag treatment is carried out by heating to 160 ℃ for heat preservation and dissolution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200410037936 CN1597525A (en) | 2004-05-14 | 2004-05-14 | Silicon slag removal treatment method in aluminium oxide production process |
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| CN 200410037936 CN1597525A (en) | 2004-05-14 | 2004-05-14 | Silicon slag removal treatment method in aluminium oxide production process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102976570A (en) * | 2012-11-26 | 2013-03-20 | 中国铝业股份有限公司 | Method for reducing alkali consumption in Bayer production process |
| CN103848452A (en) * | 2014-02-25 | 2014-06-11 | 湖南中大冶金设计有限公司 | Simple treatment method of Bayer-process red mud and sintering-process silicon slag in aluminum oxide production by series process |
| CN113683109A (en) * | 2021-08-03 | 2021-11-23 | 中铝中州铝业有限公司 | Method for controlling calcium ratio of alumina clinker |
-
2004
- 2004-05-14 CN CN 200410037936 patent/CN1597525A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102976570A (en) * | 2012-11-26 | 2013-03-20 | 中国铝业股份有限公司 | Method for reducing alkali consumption in Bayer production process |
| CN103848452A (en) * | 2014-02-25 | 2014-06-11 | 湖南中大冶金设计有限公司 | Simple treatment method of Bayer-process red mud and sintering-process silicon slag in aluminum oxide production by series process |
| CN103848452B (en) * | 2014-02-25 | 2015-10-07 | 湖南中大冶金设计有限公司 | The Simple treatment method of Bayer process red mud and silica residue in sinter process in producing alumina through series process |
| CN113683109A (en) * | 2021-08-03 | 2021-11-23 | 中铝中州铝业有限公司 | Method for controlling calcium ratio of alumina clinker |
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